Rising Concerns Over 'Zombie' Squirrels and Other Mutant Animals in North America

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Source: Forbes
Rising Concerns Over 'Zombie' Squirrels and Other Mutant Animals in North America
Photo: Forbes
TL;DR

The appearance of 'zombie squirrels' in the U.S. and Canada is due to squirrel fibromatosis, a benign tumor caused by leporipoxvirus infection, which results in lumps on squirrels' bodies. While alarming, these tumors often regress over time and do not significantly threaten squirrel populations or humans, with transmission mainly through insect bites or contact among squirrels.

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